Packing for rods and the like.



R. ALLEN. PACKING FOR RODS AND THE LIKE. I

APP cA oN FILED NOV- 15. 1911.

* Patented Dec. 28,1915.

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Specification of Letters Patent.

Fatented Deon 2%, 3 15.

Application filed November 15, 1911. Serial No. 660,561.

To all whom it may concern Be it known that I, Bonner ALLEN, a subjectof the King of Great Britain, residing at Lynwood, Kidmore Road,Caversham, Oxfordshire, England, have invented certain new and usefulImprovements in Packing for Rods and the like; and I do declare thefollowing to be a full clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

This invention for an improved packing for piston rods and ing of thetype in which segmental rings pressed against the rod by the workingpressure or springs are used in conjunction with continuouscrings.Heretofore it has been dificult to give the necessary freedom to the rodand at the same time to prevent leakage either between the rod andpacking or between the packing rings and studini box or casing.

ly invention has for its object to so construct the packing that theleakage afore said cannot occur.

The characteristic feature of my invention is that the cross sectionaldimensions of the segmental rings are such that the steam or other fluidpressure medium on obtaining access to the rings exerts an axialpressure on the rings which is much greater than the fluid pressureacting radially inward so that the friction between the segmentalpacking rin s and the adjacent continuous rings is su cient tocounteract the radial fluid pressure and keep the ring balanced.

A further feature of the invention is that packing fluid pressure isapplied to the rings by obliquely mounted springs whose pressure isdivided into radial and axial components.

The invention is illustrated in the accompanying drawings in which-Figures 1 and 2 are longitudinal and transverse sections respectively ofa me tallic packing constructed according to this invention.

As shown, the packing'comprising two segmental rings 6, continuous ringsa a and a soft packing m surrounded by a sleeve 72 with a conical bore,the packing m being pressed axially by means of a ring 0 and springs 0seated in the end of the stutling box. Preferably one or more of theplain rings a a are arranged to ht closely to the rod (1 but loosely tothe stufiig box or casthe like relates to pack-' so much greater ing eand one or more of the rings a a lit closely to the casing e andlooselyon the rod. The segmental rings Z) are forced inward against the rod bysprings 32 mounted obliquely as shown and serving also to apply axialpressure for keeping the seg ments up against the adjacent continuousrings a a. The faces of said segmental rings 6 which engage the adjacentfaces of the continuous rings a a are flat and straight while theopposite faces of said rings are inclined downwardly and outwardly for aportion of their width, each of said rings being provided with a recessin its inclined face adjacent the central opening therein whereby thearea in contact with the rod D is greatly reduced in proportion to thearea engaged with the adjacent continuous rings, and the shape of therings being such as to counterbalance the radial pressure and thus keepthe rings 6 balanced when steam or other fluid pressure medium gainsaccess thereto. The springs p are seated in recesses in the rings andare inclosed by metal caps p. The V- shaped spaces between the packingseg ments are filledby if-shaped. blocks 1) provided in a similar mannerto the segments 6 with obliquely mounted springs. The cross sectionaldimensions of the segmental rings 6 are such that where the steam orother fluid pressure medium gaihs access thereto the resulting axialpressure in the rings is than the pressure acting radially inward thatthe friction between the ring I) and the adjacent rings a or a issuiiicient to counteract the radial pressure and thus keep the ring 6balanced. T0 effect this the depth or radial dimension of the ringshould be about 5 to 8 times the rubbing width.

I claim as my invention j l. A packing for piston rods and the likecomprising a stuliing boxer casing, continuous rings surrounding themember to be" packed, pressure balanced segmental packingringsalternating with the continuous rings, and springs positioned to pressthe segmental rings inward against the member to be packed and againstthe continuous rings= 2. A packing for piston rods andvthe likecomprising a stuiiing ooX or casing, continuous rings surrounding themember to be packed pressure balanced segmental packing ringsalternating with the continuous rea I rings, and obliquelymountedsprings adapted to apply the packing pressure to the rings.

continuous rings, the cross sectional dimensions of said segmental ringsbeing such that the bearing, faces thereof in contact with the member tobe packed are. considerably less than their radial dimensions or widthswhereby the axial pressure of the pressure medium on the rings issufficiently greater than the radial pressure acting inwardly tocounteract the, radial pressure and thus keep said segmental ringsbalanced.

4. A packing for pistons and the like, comprising a stufling box,continuous. rings surrounding the member to be packed, segmental packingrings alternating with the continuous rings, the face of each segmentalring which engages the adjacent face of the continuous rings being fiatand straight while the opposite face thereof is inclined downwardly andoutwardly for a portion of its Width and has a recess formed in its ininer upper face adj acent'the central aperture therein thereby presentinga rubbing surface a mental packing rings alternating with thecontinuousrings, the fade of each segmental ring which engages the adjacent faceof the into radial and axial components; v

In testimony whereof I have hereunto se my hand in presence of twosubscribing withesses;

I ROBERT ALLEN. Witnesses:

SAMUEL PERCIVAL, DAISY NUTLEYQ continuous rings being flat and straight

